METHOD FOR CONTACT-BUTT WELDING OF TUBE WITH PLUG Russian patent published in 2007 - IPC B23K11/02 G21C21/02 

FIELD: machine engineering, namely methods for contact-butt welding of tube with plug for making fuel elements of nuclear power stations.

SUBSTANCE: method comprises steps of fixing tube at embedding tube end in opening of welding fitting having predetermined value of electric resistance; placing plug having portion welded in tube wall and outer portion in electrode for supplying welding current to outer portion of plug; compressing parts by applying welding effort; heating parts by means of welding electric current and welding them. Outer portion of plug has several parts; its part adjacent to portion welded into tube wall has diameter exceeding diameter of said part but less than diameter of opening of welding fitting. At welding process part of outer portion of plug adjacent to portion welded into tube wall is at least partially introduced into opening of welding fitting for forming annular gap between said part of outer portion and tube end. Said annular gap is filled with outer burrs. Part of outer portion of plug that is not adjacent to portion welded into tube wall has diameter exceeding diameter of opening of welding fitting.

EFFECT: improved characteristics of articles, enhanced versatility of method.

4 cl, 3 dwg, 1 ex